Spin Semiconductor

Some programs of mine for producing scales and arpeggios. ; Ascending Major Scale (Ionian Mode) by Alex Lawrow ; ================================================== ; ; The note produced by each pitch-shifter is fed into a delay line. ; The output of which is used to feed the next pitch-shifter. ; ; ...

You can't eliminate it. Larry's explanation in terms of comb filter is spot on. As posted on this forum before (Don Stavely I think), you can reduce the frequency of the tremolo at the expense of increased latency. For example, if you are pitch-shifting by an octave, rather than do that in one step,...

Look at what I posted here... https://www.diystompboxes.com/smfforum/index.php?topic=121408.msg1156740#msg1156740 Included in the zip is the Arduino program to write to EEPROM and instructions on how to use with output from SpinASM. Note that to use it you must make SpinASM output a header file, rat...

If you are on Linux (or mac) there is a Python based assembler on github.

http://www.spinsemi.com/forum/viewtopic.php?t=680#p3606

You just need to make sure you use the spin compatibility flag (-s) command line option.

According to info in the manual, the log function maps to S4.19 so if the ACC has anything smaller than 0.00001526 is will presumably map to -16 by the log() operation. In other words, it seems the log() function isn't going to work on the bottom 8 bits of the 24 bits in the ACC. I am assuming those...

I used an Arduino program to write FV-1 programs to EEPROM as part of a DIY project.
The EEPROM burner is part of the zip file here

https://1drv.ms/u/s!AvrH61utWEtEinTuwzdgxpn2TVm8

Increasing cap to 33pF solved it. Thanks.
When I first tried increasing the cap value I didn't increase it by a large enough value.
30pF didn't solve the problem but 33pF did.

To evaluate y = A / B on the FV-1 you evaluate this y = exp( log(A) - log(B) ) The problem is that the FV-1 log() only works on values in the range 0 to 1, and the exp() function only produces values in the range 0 to 1. This means that you need to make sure that the final answer lies in the range 0...

I should have just looked on the Spin knowledge base. There is a much easier way.

1/(1+9x) with x = 0 to 1
= 0.1 / (0.1 + 0.9x)
= exp( log(0.1) - log(0.1+0.9x) )

No need for fancy approximations

Regarding square x-fade. Are you suggesting to make the two weighting functions intersect each other at a level not equal to 0.5 ? I can understand that instead of averaging voltage levels (V) you may want to average power levels (V^2) instead. That makes sense to me if the 2 signals are not correla...

Thanks for the code snippet.

I tried the diffusion but it didn't really help. I am not sure how much benefit comes from using sine weighting instead of linear increasing/decreasing weights. The mix ratios for the two read pointers will still cycle between (1 : 0), (0.5 : 0.5), (0, 1). I am assuming those 3 mix ratios correspond...

Here's something I came up with which might be useful if the ramp LFOs are being used for something else. You can get a good approximation to a triangle wave using this formula ( 1 - abs(sin(t)) ) ^ 0.564476 The power is chosen to give best linearity based on the value at the halfway point. Due to t...

Looking at online images of the gutshots of that pedal you can tell that the top three controls map to the FV-1 pots. The other control pots are external to the FV-1. If they are externally modifying the clock rate to produce the "drag" effect then they are not using a crystal to clock the...

Raise to power between 1 and 5